Parser::RegexpExpr Class Reference

#include <ParserNode.h>

Inheritance diagram for Parser::RegexpExpr:

Collaboration diagram for Parser::RegexpExpr:

Public Member Functions
	RegexpExpr (bool n, Expr *a, Expr *p, Expr *e)
bool	get_is_not () const
const Expr *	get_arg () const
const Expr *	get_pattern_string () const
const Expr *	get_escape_string () const
std::shared_ptr< Analyzer::Expr >	analyze (const Catalog_Namespace::Catalog &catalog, Analyzer::Query &query, TlistRefType allow_tlist_ref=TLIST_NONE) const override
std::string	to_string () const override
Public Member Functions inherited from Parser::Node
virtual	~Node ()

Static Public Member Functions
static std::shared_ptr < Analyzer::Expr >	get (std::shared_ptr< Analyzer::Expr > arg_expr, std::shared_ptr< Analyzer::Expr > pattern_expr, std::shared_ptr< Analyzer::Expr > escape_expr, const bool is_not)

Static Private Member Functions
static void	check_pattern_expr (const std::string &pattern_str, char escape_char)
static bool	translate_to_like_pattern (std::string &pattern_str, char escape_char)

Private Attributes
bool	is_not_
std::unique_ptr< Expr >	arg_
std::unique_ptr< Expr >	pattern_string_
std::unique_ptr< Expr >	escape_string_

Additional Inherited Members
Public Types inherited from Parser::Expr
enum	TlistRefType { TLIST_NONE, TLIST_REF, TLIST_COPY }

Detailed Description

Definition at line 527 of file ParserNode.h.

Constructor & Destructor Documentation

Parser::RegexpExpr::RegexpExpr ( bool  n, Expr *  a, Expr *  p, Expr *  e  )

inline

Definition at line 529 of file ParserNode.h.

      : is_not_(n), arg_(a), pattern_string_(p), escape_string_(e) {}

Member Function Documentation

std::shared_ptr< Analyzer::Expr > Parser::RegexpExpr::analyze ( const Catalog_Namespace::Catalog &  catalog, Analyzer::Query &  query, TlistRefType  allow_tlist_ref = TLIST_NONE  ) const

overridevirtual

Implements Parser::Expr.

Definition at line 784 of file ParserNode.cpp.

                                        {
  auto arg_expr = arg_->analyze(catalog, query, allow_tlist_ref);
  auto pattern_expr = pattern_string_->analyze(catalog, query, allow_tlist_ref);
  auto escape_expr = escape_string_ == nullptr
                         ? nullptr
                         : escape_string_->analyze(catalog, query, allow_tlist_ref);
  return RegexpExpr::get(arg_expr, pattern_expr, escape_expr, is_not_);
}

void Parser::RegexpExpr::check_pattern_expr ( const std::string &  pattern_str, char  escape_char  )

staticprivate

Definition at line 747 of file ParserNode.cpp.

                                                                                  {
  if (pattern_str.back() == escape_char) {
    throw std::runtime_error("REGEXP pattern must not end with escape character.");
  }
}

std::shared_ptr< Analyzer::Expr > Parser::RegexpExpr::get ( std::shared_ptr< Analyzer::Expr >  arg_expr, std::shared_ptr< Analyzer::Expr >  pattern_expr, std::shared_ptr< Analyzer::Expr >  escape_expr, const bool  is_not  )

static

Definition at line 796 of file ParserNode.cpp.

References Analyzer::Constant::get_constval(), kBOOLEAN, kNOT, run_benchmark_import::result, and Datum::stringval.

Referenced by RelAlgTranslator::translateRegexp().

                       {
  if (!arg_expr->get_type_info().is_string()) {
    throw std::runtime_error("expression before REGEXP must be of a string type.");
  }
  if (!pattern_expr->get_type_info().is_string()) {
    throw std::runtime_error("expression after REGEXP must be of a string type.");
  }
  char escape_char = '\\';
  if (escape_expr != nullptr) {
    if (!escape_expr->get_type_info().is_string()) {
      throw std::runtime_error("expression after ESCAPE must be of a string type.");
    }
    if (!escape_expr->get_type_info().is_string()) {
      throw std::runtime_error("expression after ESCAPE must be of a string type.");
    }
    auto c = std::dynamic_pointer_cast<Analyzer::Constant>(escape_expr);
    if (c != nullptr && c->get_constval().stringval->length() > 1) {
      throw std::runtime_error("String after ESCAPE must have a single character.");
    }
    escape_char = (*c->get_constval().stringval)[0];
    if (escape_char != '\\') {
      throw std::runtime_error("Only supporting '\\' escape character.");
    }
  }
  auto c = std::dynamic_pointer_cast<Analyzer::Constant>(pattern_expr);
  if (c != nullptr) {
    std::string& pattern = *c->get_constval().stringval;
    if (translate_to_like_pattern(pattern, escape_char)) {
      return LikeExpr::get(arg_expr, pattern_expr, escape_expr, false, is_not);
    }
  }
  std::shared_ptr<Analyzer::Expr> result =
      makeExpr<Analyzer::RegexpExpr>(arg_expr->decompress(), pattern_expr, escape_expr);
  if (is_not) {
    result = makeExpr<Analyzer::UOper>(kBOOLEAN, kNOT, result);
  }
  return result;
}

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const Expr* Parser::RegexpExpr::get_arg ( ) const

inline

Definition at line 532 of file ParserNode.h.

References arg_.

{ return arg_.get(); }

const Expr* Parser::RegexpExpr::get_escape_string ( ) const

inline

Definition at line 534 of file ParserNode.h.

References escape_string_.

{ return escape_string_.get(); }

bool Parser::RegexpExpr::get_is_not ( ) const

inline

Definition at line 531 of file ParserNode.h.

References is_not_.

{ return is_not_; }

const Expr* Parser::RegexpExpr::get_pattern_string ( ) const

inline

Definition at line 533 of file ParserNode.h.

References pattern_string_.

{ return pattern_string_.get(); }

std::string Parser::RegexpExpr::to_string ( ) const

overridevirtual

Implements Parser::Expr.

Definition at line 2268 of file ParserNode.cpp.

                                      {
  std::string str = arg_->to_string();
  if (is_not_) {
    str += " NOT REGEXP ";
  } else {
    str += " REGEXP ";
  }
  str += pattern_string_->to_string();
  if (escape_string_ != nullptr) {
    str += " ESCAPE " + escape_string_->to_string();
  }
  return str;
}

bool Parser::RegexpExpr::translate_to_like_pattern ( std::string &  pattern_str, char  escape_char  )

staticprivate

Definition at line 753 of file ParserNode.cpp.

                                                                                   {
  char prev_char = '\0';
  char prev_prev_char = '\0';
  std::string like_str;
  for (char& cur_char : pattern_str) {
    if (prev_char == escape_char || isalnum(cur_char) || cur_char == ' ' ||
        cur_char == '.') {
      like_str.push_back((cur_char == '.') ? '_' : cur_char);
      prev_prev_char = prev_char;
      prev_char = cur_char;
      continue;
    }
    if (prev_char == '.' && prev_prev_char != escape_char) {
      if (cur_char == '*' || cur_char == '+') {
        if (cur_char == '*') {
          like_str.pop_back();
        }
        // .* --> %
        // .+ --> _%
        like_str.push_back('%');
        prev_prev_char = prev_char;
        prev_char = cur_char;
        continue;
      }
    }
    return false;
  }
  pattern_str = like_str;
  return true;
}

Member Data Documentation

std::unique_ptr<Expr> Parser::RegexpExpr::arg_

private

Definition at line 547 of file ParserNode.h.

Referenced by get_arg().

std::unique_ptr<Expr> Parser::RegexpExpr::escape_string_

private

Definition at line 549 of file ParserNode.h.

Referenced by get_escape_string().

bool Parser::RegexpExpr::is_not_

private

Definition at line 546 of file ParserNode.h.

Referenced by get_is_not().

std::unique_ptr<Expr> Parser::RegexpExpr::pattern_string_

private

Definition at line 548 of file ParserNode.h.

Referenced by get_pattern_string().

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The documentation for this class was generated from the following files:

• /home/jenkins-slave/workspace/core-os-doxygen/Parser/ParserNode.h
• /home/jenkins-slave/workspace/core-os-doxygen/Parser/ParserNode.cpp